Nvidia specs the GeForce 7900 GS GPU to be clocked at 450MHz, with the card's 256MB of GDDR3 memory at 660MHz (1.32GHz).
Nvidia's reference speeds are pretty conservative, and the board partners are far more optimistic. With its GeForce 7900 GS OC, EVGA has the GPU running at an aggressive 500MHz, although the memory overclock is more timid, with the RAM running at 690MHz (1.38GHz effective).
We tested a reference GeForce 7900 GS along with the EVGA, and it's clear that the overclock makes a significant difference, especially when you increase the resolution from 1,280 x 1,024
to 1,680 x 1,050. At this higher resolution, fleeing from the cops in Need for Speed: Most Wanted was smooth and easy with the EVGA, with the card averaging a respectable 44fps. The frame rate didn't dip below 31fps, while the reference card dropped to 28fps. In F.E.A.R., the story was similar. At 1,680 x 1,050 with 2x AA and 8x AF, the EVGA remained above the 25fps mark, if only by a slender margin, whereas the reference card dropped below this. Prey is a tougher workout, and at 1,680 x 1,050, the EVGA's minimum frame rates dived below 20fps during our test section of the game, although I didn't feel the game became so slow as to be unplayable. In all three tests, the EVGA excelled at 1,280 x 1,024, so it's a perfect match for a smaller monitor, although, as you'd expect, it struggled at 1,920 x 1,200.
http://www.custompc.co.uk/custompc/reviews/96674/evga-geforce-7900-gs-ko.html
